Source : Webster's Revised Unabridged Dictionary (1913)

Piaster \Pi*as"ter\, n. [F. piastre, It. piastra a thin plate of
   metal, a dollar, LL. piastra, fr. L. emplastrum. See
   {Plaster}.]
   A silver coin of Spain and various other countries. See
   {Peso}. The Spanish piaster (commonly called peso, or peso
   duro) is of about the value of the American dollar. The
   Italian piaster, or scudo, was worth from 80 to 100 cents.
   The Turkish and Egyptian piasters are now worth about four
   and a half cents.

Source : WordNet®

piaster
     n 1: a fractional monetary unit in Egypt and Lebanon and Sudan
          and Syria [syn: {piastre}]
     2: 100 kurus equal 1 lira [syn: {kuru}, {piastre}]